When one starts leaving sticky notes on the desktop for you to see in the morning? *ooops :)*
When someone does something like this to the normal tomato soup? * 😀 😀 :D*
When someone calls while on way home from work,every single day? *blush blush*
When you can see two pair of eyes meeting and exchanging something which only they can define? *ahem,ahem*
What is it called?